Question

Match the instruments in Group I with the physical quantities they measure in Group II. \[ \begin{array}{|c|c|} \hline Group I & Group II
\hline (P) \ \text{Goniophotometer} & (1) \ \text{Electromagnetic Energy at Specific Wavelengths of Light}
(Q) \ \text{Pyrheliometer} & (2) \ \text{Luminous Flux of Directed Light Sources}
(R) \ \text{Spectrophotometer} & (3) \ \text{Direct Solar Irradiance}
(S) \ \text{Forward-Looking Infrared Camera} & (4) \ \text{Temperature}
& (5) \ \text{Global Solar Radiation}
\hline \end{array} \]

• A. P-5, Q-2, R-1, S-3
• B. P-2, Q-3, R-1, S-4
• C. P-2, Q-3, R-1, S-5
• D. P-5, Q-1, R-2, S-4

Hint:

Remember: Goniophotometer → Light flux, Pyrheliometer → Solar irradiance, Spectrophotometer → Wavelength energy, FLIR Camera → Temperature.

Answer 1

The Correct Option is B

Step 1: Goniophotometer.
This instrument measures the luminous flux of directed light sources, checking how light intensity is distributed at different angles. \[ P \Rightarrow 2 \]

Step 2: Pyrheliometer.
It directly measures solar irradiance (beam radiation) from the sun. \[ Q \Rightarrow 3 \]

Step 3: Spectrophotometer.
This device measures electromagnetic energy at specific wavelengths of light, analyzing how much light is absorbed or transmitted at each wavelength. \[ R \Rightarrow 1 \]

Step 4: Forward-Looking Infrared Camera (FLIR).
This camera is used for thermal imaging → measurement of temperature. \[ S \Rightarrow 4 \] \[ \boxed{P-2, \ Q-3, \ R-1, \ S-4} \]